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Witsberry

Your CTO execution layer. Fixed-price builds, held to the WB-12 standard, run by us after launch.

Services

  • Internal Systems & Operations
  • AI Products & Systems
  • WB-12 Audit & Recovery
  • SaaS Applications
  • Mobile Apps
  • Product Websites
  • RUN: Ongoing Operations

Company

  • About us
  • Case studies
  • Free tools
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Office

128 City Road, London, EC1V 2NX, United Kingdom

Witsberry Ltd · Company No. 13858949 · Registered in England & Wales · Every certification issued under the WB-12 Standard v1.0

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HomeServicesMobile Apps (iOS + Android)

Most mobile apps get one install and zero return visits.

Mobile Apps (iOS + Android)

Production-ready iOS and Android apps built for retention, not just a listing in the App Store.

50+ products shipped13 years engineeringFour guarantees, in writing

Delivered inside

Built to hold™, fixed at $18,000

See the full program

The problem

You got the install. You didn't get the habit.

Downloads are vanity. The apps that never earned a second open share four symptoms:

01

You got the install, not the habit

Downloads spike on launch day and the app never gets opened again.

02

It works until the network doesn't

An app built assuming perfect connectivity fails exactly when users need it most.

03

App Store review just cost you a week

A guideline nobody checked upfront turns into a resubmission cycle.

04

You can't tell if day-30 retention is good or bad

Because nothing's actually measuring it.

Retention, not just installs

Come back, new activity
Day 1
Day 7
Day 30

Your guide

Shipped a mobile app and stayed on as the technical team through the DevOps, a token launch, and a 10K-download milestone. That's the standard: not handing off a build and disappearing, but staying accountable for whether it actually gets used.

More on how we work

Free framework

The Mobile Retention Checklist

Downloads are vanity. Day-30 usage is the metric that matters. We run every feature through this before it ships.

  • Does this bring users back on day 2, or just impress them on day 1?
  • Will it work offline, or does it assume perfect connectivity?
  • Does it feel native to the platform, or fight iOS/Android's own conventions?
  • Could this risk an App Store or Play Store rejection or review delay?
  • Can you measure whether this is actually used after 30 days, not just downloaded?
  • If push notifications disappeared tomorrow, would this feature still get used?

The plan

How we actually do it.

01

Design for day 2, not day 1

Design for day 2, not day 1

Retention hooks and push strategy planned before a single screen gets built.

02

One codebase, both platforms

One codebase, both platforms

Flutter build with near-native performance, so iOS and Android ship together, not six weeks apart.

03

Pre-check the guidelines

Pre-check the guidelines

App Store and Play Store review requirements accounted for before submission, not discovered after rejection.

04

Measure past install day

Measure past install day

Analytics wired to track day-2, day-7, day-30 usage from launch, not bolted on when someone finally asks.

What's included

01

One app, both stores, no compromise

One codebase, near-native performance on iOS and Android, shipped in weeks instead of two parallel builds.

02

Bring users back on day 2

Retention hooks and targeted push notifications designed in from the start, tuned for day-30 usage, not just the install.

03

No surprise rejections

Full App Store / Play Store submission handled end to end, review guidelines accounted for upfront, so rejections are rare and fixable same-sprint.

50+
Products shipped
13
Years engineering

Witsberry took the idea and ran, they built the whole mobile app, launched the Minty token, and stuck around as our technical team handling all the DevOps. We shipped in 7 weeks and hit 10K downloads fast. I didn't just get a dev shop, I got a team that actually understood where I was trying to go.

Ismail R., Founder, Viddli

If nothing changes

What happens when retention isn't designed in

Most mobile budgets go to acquisition (ads, App Store optimization, launch marketing) while retention gets treated as a post-launch fix. It isn't one. An app losing 80% of users by day 7 doesn't need a bigger marketing budget; it needed the retention design done before the first sprint, not after the download numbers came in.

Free tool

App Icon Color Psychology Checker

Your app icon is the first (and sometimes only) impression. Check how it reads before you submit.

Try it free

Common questions

Flutter by default: one codebase, near-native performance for both iOS and Android, unless your product has a specific reason to go fully native.

We handle the entire submission process and account for platform review guidelines upfront, so rejections are rare and fixable within the same sprint, not weeks of resubmission.

The first 90 days of Run are included free, covering OS updates, bug fixes, and store policy changes. After that, Run continues from $2,400/month if you want us to keep operating it.

Yes, these are standard scope for mobile builds, not add-ons.

Other ways we help

Internal Systems & Operations Software

The software your business actually runs on. Inventory, orders, bookings, and finance in one system instead of six spreadsheets and a WhatsApp group. Architected so it can become a product you sell to others later, not just a tool you use now.

Learn more

AI Products & Systems

AI workflows and agents built around tasks that happen at real volume and save real hours, or we tell you it's not worth building yet. Every integration ships with audit trails and usage logging built in.

Learn more

SaaS Applications

Multi-tenant SaaS platforms architected for the users you have today, and built so your first external customer can onboard without touching the codebase. Priced on value, not seats.

Learn more

Ready to build something that holds?

Start with the free WB-12 readiness audit. No call required, and you keep the report either way.

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